Darktable is the best photography editing and classifying software I've ever used. New users should be warned it's quite power-user centric though. Adopting isn't like opening up Lightroom and messing around. You may have to read a bit of documentation regarding the modules and different workflows (i.e. Sigmoid vs FilmicRGB).

I think the Ansel developer has a YouTube series with tutorials on how to edit in Darktable using the Filmic RGB workflow. Not sure if that's where I'd get started nowadays (I've just adopted Sigmoid and it's way quicker to edit with it), but it gave me a solid base in how to use this software.